import math

a, b, c = map(int, input().split())

if a == 0:
    if b == 0:
        if c == 0:
            print(-1)
        else:
            print(0)
    else:
        x = (-c) / b
        print(1)
        print("{0:.15g}".format(x))
else:
    D = b * b - 4 * a * c
    if D < 0:
        print(0)
    elif D == 0:
        x = (-b) / (2 * a)
        print(1)
        print("{0:.15g}".format(x))
    else:
        sqrtD = math.sqrt(D)
        x1 = (-b - sqrtD) / (2 * a)
        x2 = (-b + sqrtD) / (2 * a)
        if x1 > x2:
            x1, x2 = x2, x1
        print(2)
        print("{0:.15g}".format(x1))
        print("{0:.15g}".format(x2))